A new version of the redSn0w iPhone unlock tool has been released on the Cydia repository with increased compatibility with iOS 5.0.1. The new unlock tool is compatible with the iPhone 3GS as long as the baseband version is set atÂ 04.26.08 â€“ 05.11.07 â€“ 05.12.01 â€“ 05.13.04 â€“ 06.15.00 with the iPhone 4 now compatible if the baseband is set at 01.59.00. As the unlock tool requires a backup and jailbreak in order to preserve basebands, this is not recommended for novices.